They were offered a few cosmetic improvements to their working conditions, but nothing of significance. And what might be the underlying significance of. The state or quality of being significant:
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A matter of some significance. The significance of something is the importance that it has, usually because it will have an effect on a situation or shows something about a situation. A meaning that is expressed or implied:
Importance, consequence, moment, weight, significance mean a quality or aspect having great worth or significance.
Meanings, etymology, pronunciation and more in the oxford english dictionary
